The ameliorative role of curcumin in attenuating gentamicin-induced nephrotoxicity has been reported earlier however, the mechanism of action remains unclear. Gentamicin was injected intraperitoneally (100 mg/kg body weight) once daily for 6 days. Curcumin was administered orally (200 mg/kg body weight) once daily for 7, 15 and 30 days. Gentamicin-induced rats showed significant increase in the levels of kidney markers and the activities of urinary marker enzymes, which was reversed upon curcumin treatment. A significant increase in kidney lipid peroxidation (LPO) and decrease in activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione-S-transferase (GST) and reduced glutathione (GSH) were observed in gentamicin-induced rats. Immunohistochemical, Western blot and RT-PCR studies in gentamicin-induced rats also demonstrated an increase in the levels of inducible nitric oxide synthase (iNOS) and nuclear factor-κB (NF-κB). All these effects induced by gentamicin were reduced upon treatment with curcumin in a time dependent manner. To conclude, curcumin enhances antioxidants, and decreases iNOS and NF-κB, thereby protecting the cells against oxidative stress induced by gentamicin.
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Article Synopsis
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- * Results showed that beta-carotene significantly reduced markers of liver and kidney damage (like SGOT, SGPT, creatinine, and urea levels) compared to gentamicin alone, suggesting it may be beneficial as an additional treatment for patients receiving gentamicin.
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